<!DOCTYPE html>
<html>
  <script>
    function vendGetter(name) {
      return function() { throw "Getting " + String(name) };
    }
    function vendSetter(name) {
      return function() { throw "Setting " + String(name) };
    }
    var setupThrew = false;
    try {
      // Neuter everything we can think of on Promise.
      for (var obj of [Promise, Promise.prototype]) {
        propNames = Object.getOwnPropertyNames(obj);
        propNames = propNames.concat(Object.getOwnPropertySymbols(obj));
        for (var propName of propNames) {
          if ((propName == "prototype" ||
               propName == Symbol.hasInstance) &&
              obj == Promise) {
            // They're not configurable.
            continue;
          }
          Object.defineProperty(obj, propName,
            { get: vendGetter(propName), set: vendSetter(propName) });
        }
      }
    } catch (e) {
      // Something went wrong.  Save that info so the test can check for it.
      setupThrew = e;
    }
  </script>
</html>
